Pump



F. STICKEL,

PUMP.

APPLICATION HLED JULY 23 www .mf W

naar `s FBC@ To all w/zom it may concern:

Be it known that l, FREDERICK STICKEL, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

My invention relates to improvements 1n pumps and has special reference to manually operated air pumps for filling pneumatlc tires.

The object of my invention is to provide a combined pump and indicator by means of which the operator can see at all times the pressure which has been produced in the tire without .the necessity of changing any valve or connection.

Preferably I embody my invention in the form of a relatively large pump, which obviously can be one or two stage, and provide the pump with foot plates upon which the operator places his feet for holding the pump stationary during operations. Adjacent to the vertical cylinder of the pump l arrange an indicating cylinder containing a spring pressed piston adapted to be moved against the spring pressure by the air pressure produced. The piston rod upon which the piston is mounted extends out through the upper end of the indicating cylinder and l provide a pressure-indicating scale on the adjacent side of the pump cylinder adapted, in conjunction with the upper end of the piston rod, to show the air pressure produced.

Other features of my invention relate to an improved manner of admitting the air to the pump Cylinder and to means for adjusting the tension of the spring for causing the indicator to accurately show the pressure.

My invention will be more readily understood by reference to the accompanying drawings forming part of this specification, and in which 1&-

Figure 1 is a side elevation of a pump embodying my invention;

Fig. 2 is a longitudinal vertical section on the line 2 2 of Fig. 1;

Fig. 3 is a horizontal section on the line 3-3 of F ig. 2; and i F ig. 4 is a horizontal section of the pump Specication of Letters Patent.

Patented July i2, 1192i. i920. serial no. 398,404.

cylinder in the line 4-4 of Fig. 2 and showing the flap valve.

I n said drawings, 1 is a pump cylinder. Thiscylinder is mounted rigidly at its lower end 1 n a base 2, to stand vertically. The base 1s provided with suitable flat extensions 3 upon which the operator can place his feet for holding the pump when 1n use. The cylmder 1 is open at its bottom and connects with .a passage 4 in the base 2 through which the air is delivered from the cylinder 1.

Mounted in the cylinder is a leather cup plston 5 arranged to compress the air as it is forced downwardly. The piston is mounted on the lower end of a piston rod 6 which extends through the cylinder and projects through a central guide opening 7 in a cap 8 secured to and closing the upper end of the cylinder 1. The outer end of the rod'G has a suitable handle 9 secured thereto. A transverse pin or stop 10 carried by the rod 6 prevents the piston 5 striking the base 2 at the lower end of the down stroke. The rod 6 is hollow from end to end having a central passage 11 for admitting air to the space below the piston 5 without the necessity of the air passing the periphery of the piston and l control the lower open end of the passage 11, through the rod 6, by a simple check valve 12. This valve consists of a flat yielding closure member 13 preferably made of rubber or leather, mounted within the piston 5 and adapted to seat upon and tightly close the lower end of the tubular piston rod 6. The closure member 13 is carried by a light tia-t spring 14 secured at one end to the piston head 5 by a screw 15, thus providing a flat check valve.

To avoid a back pressure or a vacuum in the upper end of the cylinder 1, l. provide a vent opening 16 in the tubular wall of the piston rod near its lower end. Atmospheric air can freely enter and escape from the upper end of the cylinder through this vent opening, even though the fit of the rod 6 in the cap might be too close to allow this.

Mounted on the base 2 and standing up parallel with the cylinder 1, l arrange an auxiliary cylinder 17. The lower end of this auxiliary cylinder is in communication with the passage 4 by means of a vertical passage 18 which is controlled by a check valve 19. The valve 19 as shown, being a ball check valve. The ball is adapted to close the passage 18 b gravity and to be lifted by air pressure eneath the valve. Between the valve and the cylinder 17 -I arrange an outlet 20 controlled by a cock 21 and having a nozzle 22 adapted to be connected by a rubber hose 23 to the tire to be pumped up.

Within the cylinder 17 I provide a piston head 24 consisting of a leather cup piston 25 held in place on the lower end 26 of a piston rod 27. the cylinder 17 and has 'a thin washer-like head 28 secured upon its upper, exposed end. The cup piston 25 is held against a fixed washer or collar 29 on the rod 27 by jam nuts 30. I close the upper end of the auxiliary piston 17 by a screw threaded collar or abutment 31 which is 'adapted to be screwed down into the upper end of the cylinder. The abutment 31 is provided with a head 32 by which iii can be readily adjusted.

Between the adjustable abutment 31 and the collar 29 on the piston rod 27 I arrange a compression spring 33 within the cylinder 17 which is 'adapted to resist theupward movement of the piston 25 under the iniuence of the pressure in the base produced by the pump.

For indicating the pressure produced I provide a scale 34 on the side of the pump cylinder 1, extending u wardly above the upper end of the auxi iary or indicating cylinder 17, the periphery of the thin hea 28 on the piston rod 27 being adapted to indicate on the scale 34 thei pressure produced.

In making my combined pump and indicator I calibrate the scale 34 with the use of a standard pressure gage connected to the delivery end of the device in a manner which will be well understood by those skilled in the art.

The interior of the auxiliary cylinder above the piston 25 is freely open to the atmosphere so that the piston can freely assume a position of balance between the pressure 4beneath it and the spring 33.

From time to time the pump can be compared with a standard pressure gage and if the spring has changed so th'at the indications are not accurate the tension of the spring can be changed or adjusted by means of the adjustable abutment 31 in an obvious manner.

For convenience I arrange the scale 34 both so as to be easily read right side up and wrong side up so that the one operating the pump can as readily read the indications when leaning over the pump in a position with his head hanging down as can one standing along side of the device.

It will be clear that as the indicating The rod extends up through' spring in the cylinder Surrounding cylinder is constantly in communication with ,the delivery passage of the pump the indications will at all times show the pressure of the air which is being delivered 'and if the delivery hose 23 is connected to a tire this indicated pressure will be the pressure of the air in the tire.

It will be understood that no valves need be operated by hand or connections made or broken in order that the attained pressure in the tire may be ascertained or observed.

As it will be obvious that many modifications of my invention will readily suggest themselves to one skilled in the art, I do not limit or confine my invention to the specific constructions herein shown and described except within the scope of the appended claims.

I claim:

1 In a tire pump, a foot plate, a pump cylinder rising from the foot plate, an indicating cylinder also rising from the foot plate 'and arranged parallel and adacent to the pump cylinder and shorter in lJength, a spring held plunger projecting out of the top of the indicating cylinder and adapted to be forced out by the pressure produced in the pump cylinder, a pressure scale on the pump cylinder above the indicating cylinder and adapted to coperate with the outer end of the plunger to indicate the pressure produced by the operation o the pump, and means adapted to freel connect the lower end of the indicating cy inder with a tire.

2. In a tire pump, a foot plate, a p ump cylinder upstanding from the plate, a vertical indicating cylinder alongside the pump cylinder, the plate having a passage connecting the lower ends of the two cylinders, a pressure tight piston in the indicatin cylinder, a piston rod carried thereby an projectin through the top of the indicating cylin er, an adjustable head closing the upper end of the indicating cylinder, a compression spring in the indicating cylinder between the piston and the adjustable head, anda pressure scale on the side of the pump cylinder above the indicating cylinder adapted to coperate with the outer end of the piston rod to indicate the pressure produced by the pump, a check valve in the passage connecting the lower ends of the cylinders and means for delivering air from the lower end of the indicating cylinder to 'a tire.

3. In a device of the kind described, an indicating cylinder, a cup piston in the cylinder, a rod carrying the piston and projecting from one end of the cylinder, a. the rod and having its inner end against e piston, and an adjustable abutment at the outer end of the cylinder against which the upper end of the spring abuts for adjusting the tension of the spring.

messie (53 e. The improvements herein described, e. dic'ating means for showing the pressure, vertical pump, an auxiliary cylinder parallel the pressure indicating figures on the scale 10 therewith, and in communication therewith being arranged to be reed in upright and im at its lower end, means adapted to be proreversed position.

5 jected from the upper end of the auxiliary Signed at Chicago, illinois, this 20th day to indicate the pressure produced by the of July, 1920. pump and e scale on the adj scent side of the pump cylinder for coperetion with said inllREDERlCK S'lillfCKEL. 

